<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>练习</title>
    <style>
      .box {
        display: flex;
        flex-wrap: wrap;
        align-content: flex-start;
        /*align-content的默认值是什么？  */
        width: 250px;
        margin: 100px auto;
      }

      .box li {
        width: 24px;
        height: 24px;
        background-color: pink;
        margin: 15px;
        list-style: none;
        background: url(../img/sprite.png) no-repeat center;
      }
    </style>
  </head>

  <body>
    <div class="box">
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
    </div>
    <script></script>
  </body>
</html>
